![]() ![]() ![]() At the end of this stroke, a spark plug provides the compressed fuel with the activation energy required to begin combustion. Compression stroke: The intake valve is closed, and the piston moves up the chamber to the top.Intake stroke: The piston moves downward to the bottom this increases the volume to allow a fuel-air mixture to enter the chamber.There is an animation of a four-stroke engine and a further explanation of the process below. ![]() The four-stroke engine is the most common type of internal combustion engine and is used in various automobiles that specifically use gasoline as fuel like cars, trucks, and some motorbikes.Ī four-stroke engine delivers one power stroke for every two cycles of the piston (or four-piston strokes). ![]()
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